JP2008228243A - Video playback apparatus and rebuild processing method - Google Patents

Abstract

In a video playback apparatus having a disk system with a redundant configuration, a disk rebuild process can be executed at high speed without affecting video playback.
When a disk 13 'in which video data is stored is damaged or replaced, a video playback rebuilding means 32 uses data read from the disks 11 and 12 during playback of the video data. The rebuild process of the disk 13 'is executed in parallel with the video reproduction by the video reproduction unit 40.
[Selection] Figure 4

Description

  The present invention relates to a video playback apparatus using a disk system having a redundant configuration, and more particularly to a video playback apparatus capable of executing disk rebuild processing at high speed without affecting video playback. is there.

  A redundant disk system is used as a means for compensating for a data error due to disk damage. The redundant disk system is a system in which redundant data for compensating for a data error is distributed and recorded on a plurality of disks together with data, and the damaged data is restored using the redundant data when the disk is broken. As a configuration of such a disk system, RAID 1 that records a copy of data, RAID 5 that records data parity, and the like are used (see Non-Patent Document 1).

  Even in a video playback device that plays back data stored on a disk in real time, a redundant disk configuration is used in order to avoid failure or interruption of video playback due to damage to the disk (see Non-Patent Document 2).

  In a redundant disk system, when a disk is damaged, a rebuild process is required to replace the damaged disk and write the redundant data back to the replaced disk. The rebuild process requires reading data, generating redundant data, and writing redundant data to the replaced disk. However, if the capacity of the disk is large, it is extremely difficult to complete all rebuild processes. Takes time.

Also, depending on the configuration of the disk system, the disk access is prohibited during rebuilding, or the access speed becomes very slow even when it is permitted. For this reason, in a video playback device having a redundant disk, it is difficult to ensure the data reading speed required for real-time video playback during rebuilding, and video cannot be played back. For this reason, the problem that the operation of the apparatus is hindered by the rebuilding process of the disk is unavoidable especially when the video is continuously reproduced as in a movie theater or an exhibition hall.
David A. Patterson, Garth Gibson, and Randy H. Katz, “A case for redundant arrays of inexpensive disks (RAID)”, In Proceedings of the 1988 ACM Conference on Management of Data (SIGMOD), Chicago IL, June 1988, pp .109-116. Japan Patent Office General Affairs Department Technical Research Section Technology Trends Group, “Nonlinear Editing, 2-2-3 HDD Configuration Method”, [online], March 28, 2003, Japan Patent Office, [Search February 7, 2007], Internet, <URL: http://www.jpo.go.jp/shiryou/s_sonota/hyoujun_gijutsu/nle/nle-2-2-3.html>

  A first problem of the present invention is to prevent a video reproduction failure due to disk damage in a system for reproducing video data stored on a disk, and a second problem is to replace a damaged disk. As a result, when it is necessary to rebuild the data, the rebuild process is performed at high speed for the content to be played back, and the third problem is a wasteful rebuild for the content that does not require a rebuild. Completing the rebuild process without executing the process, the fourth challenge is to automatically execute the rebuild process for content that is not subject to playback without affecting the video playback. It is to be.

  According to the present invention, in a video playback apparatus having a disk system with a redundant configuration, when a disk is damaged or replaced, a disk rebuild process is performed using data read during playback of video data. Features. As a result, the rebuild process can be executed at high speed without affecting the video reproduction.

  In other words, in order to solve the first problem, the video playback apparatus according to the present invention is capable of storing redundant data stored in the remaining disks even if some of the multiple disks are damaged during real-time video playback. There is provided error correction means for restoring the data of the failed disk and supplying correct data to the video reproduction unit.

  Further, in the present invention, in order to solve the second problem, when a damaged disk is replaced with a new disk, the data restored by using the read data by the error correction means at the time of video reproduction is replaced with the replaced disk. On the other hand, there is provided a video playback rebuild means for simultaneously executing video playback and rebuild processing by writing video data in parallel with reading of video data.

  In order to solve the third problem, the rebuilding means is provided with means for selecting data to be rebuilt on a content basis.

  In order to solve the fourth problem, there is provided a video non-reproduction rebuilding means for performing rebuild processing at a time other than during video reproduction for content data that is not to be reproduced. The rebuild means interrupts the rebuild process when the video playback starts, and restarts the rebuild process from the interrupted position when the video playback ends.

  Specifically, the present invention provides a disk system composed of a plurality of disks in which video content data to be played is stored redundantly, and converts video data read from the disk system into a video signal in real time. When a part of the plurality of disks is damaged, the data of the failed disk is stored using redundant data stored in another disk. Error correction means for restoring and supplying correct data to the video playback means, and playback by the video playback means when the damaged disk is replaced with a new disk and the video playback means is performing video playback operation For the video data read out for the purpose, the data restored by the error correction means is converted into the video reproduction means. In parallel with the supply of the data, a video reproduction rebuild means for writing to the new disk is provided, and the video reproduction by the video reproduction means and the video reproduction rebuild means for the video data that needs to be rebuilt. The rebuild process is executed simultaneously.

  Further, according to the present invention, in the above configuration, content attribute information having information indicating whether a content name and a rebuild target are stored and content recording position information in the disc system are stored for each content, and the content management information thereof is stored. Content management means for managing video, and the video reproduction rebuild means refers to the content management information, selects data to be rebuilt in units of content, and performs rebuild processing only for content data to be rebuilt It is characterized by performing.

  Further, the present invention provides the video non-reproduction in which, in the above configuration, when the damaged disk is replaced with a new disk and the video reproduction means is not performing a video reproduction operation, redundant data is written to the replaced new disk. The content attribute information in the content management information managed by the content management means includes rebuild end position information in the content to be rebuilt, and the video non-reproduction rebuilding unit executes rebuild processing when the video is not reproduced. When the video playback starts, the rebuild process being executed is interrupted, the rebuild end position information up to the present is set in the content attribute information in the content management information, and when the video playback ends, the rebuild end position Restart the rebuild process from the point of interruption indicated by the information. And features.

  In the video reproducing apparatus of the present invention, by recording redundant data on a plurality of disks, data can be reproduced without error even when a disk failure occurs. In addition, a rebuild process can be executed on a disk replaced with a failed disk without affecting the video playback during the video playback by using the real-time rebuild function by the rebuild means during video playback. In addition, it is possible to execute rebuild processing for data that is not to be played back when playback stops, and it is possible to restart the rebuild processing from the position where it was interrupted when rebuilding is resumed.

  FIG. 1 shows the overall configuration of a video playback apparatus according to the present invention. The video reproducing apparatus 1 includes a disk unit 10 composed of a plurality of discs 11, 12, and 13, a disk interface unit 20 composed of a plurality of disk interfaces 21, 22, and 23, an error correction unit 30, a video reproducing unit 40, and a content management unit 50. The content management unit 50 manages the content and the recording position of the content in the disc.

  The error correction unit 30 includes a data input / output buffer, and also includes a video non-reproduction rebuilding unit 31 and a video reproduction reconstruction unit 32. The video non-reproduction rebuilding means 31 performs a process of writing redundant data on the replaced new disk when the damaged disk is replaced with a new disk and the video reproduction unit 40 is not performing the image reproduction operation. In addition, the video reproduction rebuilding unit 32 replaces the damaged disc with a new disc, and the video data read for reproduction by the video reproduction unit 40 when the video reproduction unit 40 is performing the video reproduction operation. On the other hand, the data restored by the error correction unit 30 is written to a new disk in parallel with the data supply to the video reproduction unit 40.

  FIG. 2 shows the operation of the video reproduction apparatus when the disc is operating normally in the embodiment of the present invention. The video data stored in the disk unit 10 is read out through the disk interface unit 20, supplied to the video reproduction unit 40 through the error correction unit 30, and converted into a video signal in real time.

  The redundant data read from the disk unit 10 is used by the error correction unit 30 to detect the occurrence of an error. In the content management unit 50, an operation for converting the playback frame position into the recording position of the disc is performed.

  FIG. 3 shows the video playback operation when a disk failure occurs in the embodiment of the present invention. When the disk unit 10 or the error correction unit 30 detects the occurrence of an error and a failed disk, the video reproduction apparatus 1 separates the failed disk. In FIG. 3, it is assumed that a failure has occurred in the disk 13. The data recorded on the disk 13 is restored in the error correction unit 30 based on the data read from another disk. By detecting the failed disk, detaching the disk, and correcting the error in real time, error-free data is supplied to the video reproduction unit 40, and a failure occurring in the video signal can be prevented.

  FIG. 4 is a diagram for explaining the disc rebuild process at the time of video reproduction in the embodiment of the present invention. In FIG. 4, the disk 13 'is a replaced disk and is a rebuild target disk. The video error correction and playback functions are the same as in the example described with reference to FIG. Here, during the rebuild process of FIG. 4, only the disk interface 23 'for the disk 13' operates in the write mode, and the video reproduction rebuild means 32 writes the data restored by the error correction unit 30 to the disk 13 '. I do. Since the rebuild process and the playback process are performed in parallel, the playback of the video is not affected by the rebuild process. Further, the content management unit 50 records the position at which the rebuild is completed by the rebuild completion notification and the data reading position information.

  FIG. 5 is a diagram for explaining the operation of the rebuild process when video is not reproduced. When the video is not played back, the rebuild process is performed on the data position designated by the content management unit 50 by the rebuilding means 31 when the video is not played back. When the start of video playback is notified from the video playback unit 40, the rebuild process is immediately interrupted. On the other hand, when the end of video reproduction is notified, the rebuild process is restarted from the recorded data position. Since the rebuild process is stopped during video playback, it is possible to avoid the influence of the rebuild process on video playback.

  FIG. 6 shows a configuration example of management information in the content management unit 50. 51 to 53 are content attribute information, and 54 to 59 are lists indicating content recording positions.

  In the content management unit 50, a content name, a list of content recording positions on the disc, a rebuild target flag indicating whether the content is a rebuild target, and a pointer indicating the rebuild end position are recorded as attribute information. The By removing the contents scheduled to be erased and the contents scheduled to be reproduced from the rebuild target, the rebuild process can be specified only for the data that needs to be rebuilt.

  In addition, since the rebuilding end position is recorded for each content, it is possible to restart the temporarily stopped rebuilding process from the end position. Since the rebuild process is performed in the order of the playback data of the video, only the pointer information for the data in the content needs to be recorded in order to record the rebuild interruption position.

  FIG. 7 is a flowchart of the rebuild process by the video reproduction apparatus 1 according to the embodiment of the present invention.

  FIG. 7A shows the operation of the system when a disk failure occurs. If a disk failure is detected during video playback by the video playback unit 40 (S10), the failed disk is disconnected (S11), and playback is continued without redundancy (S12).

  FIG. 7B shows the rebuild operation after the disk replacement. The rebuild process can be performed by replacing the failed disk. When the replacement disc is inserted, the content management unit 50 checks whether there is a rebuild target content (S20). If there is no content to be rebuilt, the rebuild is complete.

  At the time of non-reproduction, a rebuild process is executed by the video non-reproduction rebuilding means 31 for the content to be rebuilt in the content management unit 50 or the rebuild target content specified by the user (S21). When the rebuild process for all the contents selected as the rebuild target is completed, the rebuild is completed.

  If playback is started while the rebuild process is being executed, the rebuild process being executed is interrupted, and the content management unit 50 records to what position the rebuild process has been executed (S22).

  Next, it is determined whether or not the content to be reproduced has already been rebuilt (S23). If the content has been rebuilt, reproduction is performed in a redundant configuration (S24). If the rebuild has not been completed, playback is performed while the real-time rebuild process is being executed by the video playback rebuilding means 32 (S25).

  If playback is performed to the end while executing the real-time rebuild process, the corresponding content is already rebuilt. When the playback is completed, the process returns to the rebuild process at the time of non-playback, and the rebuild process that was interrupted is resumed from the recorded position.

  The above rebuild process can also be realized by a computer and a software program provided in the video reproduction apparatus 1, and the program can be provided by being recorded on a computer-readable recording medium or provided via a network. It is.

It is a figure which shows the whole structure of the video reproduction apparatus by this invention. It is a figure which shows the operation | movement at the time of the video reproduction of a video reproduction apparatus. It is a figure which shows the operation | movement of video reproduction | regeneration when a disk failure generate | occur | produces. It is a figure which shows the operation | movement of the rebuild process at the time of video reproduction | regeneration. It is a figure which shows the operation | movement of the rebuild process at the time of image | video non-reproduction | regeneration. It is a figure which shows the management method of content management, selection of the rebuild object, and a rebuild end position. It is a flowchart of a rebuild process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video reproduction apparatus 10 Disc part 11-13 Disc 20 Disc interface part 21-23 Disk interface 30 Error correction part 31 Rebuild means at the time of image non-reproduction 32 Rebuild means at the time of image reproduction 40 Video reproduction part 50 Content management part 51-53 Content attribute Information 54-59 Content recording position

Claims (4)

A disk system composed of a plurality of discs in which video content data to be played is stored redundantly, and video playback means for converting the video data read from the disk system into a video signal in real time and outputting the video signal; In the video playback device
Error correction in which, when some of the plurality of disks are damaged, the data of the failed disk is restored using redundant data stored in another disk, and correct data is supplied to the video reproduction means Means,
When the damaged disk is replaced with a new disk and the video playback means is performing video playback operation, the video data read for playback by the video playback means is restored by the error correction means. Reconstructing means at the time of video reproduction for writing the recorded data to the new disk in parallel with the supply of data to the video reproducing means,
A video playback apparatus, wherein video playback by the video playback means and rebuild processing by the video playback rebuild means are simultaneously executed for video data that needs to be rebuilt. Content management means for storing content attribute information having information indicating whether the content name and the rebuild target or not, and the recording position information of the content in the disc system, and managing the content management information for each content unit,
The rebuild during video playback refers to the content management information, selects data to be rebuilt in units of content, and executes a rebuild process only for content data to be rebuilt. Item 2. The video playback device according to Item 1. When the damaged disk is replaced with a new disk, and the video playback means is not performing a video playback operation, it comprises a non-playback rebuild means for writing redundant data to the replaced new disk,
The content attribute information in the content management information managed by the content management means includes rebuild end position information in the content to be rebuilt,
When the video reproduction starts when the video non-reproduction rebuilding means is executing the rebuild process during the video non-reproduction, the rebuild process being executed is interrupted, and the content attribute information in the content management information The video reproduction device according to claim 2, wherein rebuilding end position information is set, and the rebuilding process is restarted from the interruption position indicated by the rebuilding end position information together with the end of video reproduction. A disk system composed of a plurality of discs in which video content data to be played is stored redundantly, and video playback means for converting the video data read from the disk system into a video signal in real time and outputting the video signal; A rebuild processing method in a video playback device having:
Error correction in which, when some of the plurality of disks are damaged, the data of the failed disk is restored using redundant data stored in another disk, and correct data is supplied to the video reproduction means Process,
When the damaged disk is replaced with a new disk, and the video playback means is not performing video playback operation, a video non-playback rebuild process for writing redundant data to the replaced new disk;
When the damaged disk is replaced with a new disk and the video playback means is performing video playback, the video data read for playback by the video playback means is restored by the error correction process. A rebuilding process at the time of video playback for writing the recorded data to the new disk in parallel with the supply of the data to the video playback means,
A rebuild processing method characterized in that video playback and rebuild processing are executed simultaneously on video data that requires rebuild processing.

Images